chapter 4

Question 1

acceleration

Answer 1

Acceleration is the rate at which an object’s speed or direction changes, measured in meters per second squared (m/s²).

Question 2

gravity

Answer 2

Gravity is the force that pulls objects toward each other, like how Earth pulls everything toward its center.

Question 3

free fall

Answer 3

Free fall is when an object falls under the influence of gravity alone, with no other forces (like air resistance) acting on it.

Question 4

terminal velocity

Answer 4

Terminal velocity is the maximum speed an object reaches when falling through a fluid (like air) when the downward force of gravity is balanced by the upward force of air resistance (drag).

Question 5

• Explain gravity and how it is measured

Answer 5

Gravity is the force that pulls objects toward each other, and on Earth, it is measured by the acceleration due to gravity, which is 9.8 m/s² (meters per second squared).

Question 6

• What variable represents gravity?

Answer 6

The variable that represents gravity is (g), which stands for the acceleration due to gravity. On Earth, (g) is 9.8 m/s².

Question 7

• What is the value of the constant for gravity?

Answer 7

The value of the constant for gravity, known as the acceleration due to gravity on Earth, is 9.8 m/s² (meters per second squared).

Question 8

• Understand how to find the velocity of something falling due to free fall.

Question 9

• What are examples of objects in free fall?

Answer 9

Examples of objects in free fall include:

1. A skydiver before opening their parachute.
2. A ball dropped from a tall building.
3. An apple falling from a tree.
4. A rock falling off a cliff.
5. An object released in a vacuum where there is no air resistance (like on the Moon).